Apparatus for maintaining uniform oil level



April 3, 1928.

A. E. GRANT APPARATUS FOR MAINTAINING UNIFORM OIL LEVEL Filed June 10, 1927 IN VE IV 70/? fllber/ E. Gran! Patented 3, 1928.

UNITED STATES PATENT-OFFICE,

ALBERT E". GRANT, or NEW YonK, 'N. r.

arranartis ron MAINTAINING UNIFORM on.- Levi-1L.

Application filed June l0,

tems.

The object of my invention is to provide means for supplying oil from a main reservoir to an auxiliary reservoir and for main taining a constant level of oil in said auxiliary reservoirand for returning all excess oil flowing into .said reservoir, back-to the main reservoir, the burners being from the auxiliary reservoir.

In carrying out my invention I prefer to employ a multiple rotary gear pump, one set of gears constituting a pump, serving to pump oil from the auxiliary reservoir to the. main reservoir, and one set serving to pump oil from the main reservoir to theauxiliary J reservoir, tie first named pump having a slightly greater capacity than the second I pump.

My construction also embodies a third gear pump which serves-to prevent leakage of oil thru the hearings to the ex terior of the casing and to draw oil thru said bearing to lubricate the same: All three pumps are driven in unison from a single driving shaft connected to a motor.

Referring to the drawings which form part of this specification:

of the main shaft of the motor.

and auxiliary reservoirs are also illustrated,-

- mounted on the main sha 'spectively, in each Figure 1- is a plan view part1) in section of pumps for oil in which my invention is embodied, the pumps and bearings being. disclosed in section on the line through the axis The main plane surfaces which abutand are held together by bolts and nuts K-K etc.

- The sections C- F and I, are each formed with twocircular chambers L and L reof which is located a tooth gear M, one .above the other, and each pair meshed together to serve as a pump, the

the upper ones I A. Chambers N and N respectively are formed between the sections D and E and between G and H, thru which'the main shaft extends, and these chambers are connected by a passage 0,

lower gears being driven b My invention relates to oil burning sy'ss.

supplied to make the gears slightly wider in the pump in section C to increase the capacity of s pp y.

1927. serial No. 197,834.

which leads therefrom to the chamber PV 7 formed between theen'd J as illustrated. I

The outlet for these chambers is thru a plate Q, and section passage G to-the inlet side of the pump in section F, which discharges thru passageE andthru pipe E into the outlet pipe H The capacities of the pumps in sections F and I are practically the same but "I prefer thispump relative tothat. ofthe pump in section F. An end-cap 3, forms one, side of the pump chamber of section C, and is provided with an outlet passage pump chamber which leads into the main reservoir S, by way of pipe S A pipe T extends into the auxiliary chamber T and its lower end is located at the height there in at which the Oil level is to be maintained,

from said Y and its opposite end is connected to the section D which is provided with an inlet passage D in open communication withtheinlet to the pump in section 0. 'A'pipe J leads from the lower end of the main reser-' voir' S, to the inlet passage J leadin to the inlet of the pump in section I, w ich pump discharges thru outlet passage H? into the upper end of the pipe H thus discharginghoil' into-the auxiliary reservoir, to

the auxiliaryreservoir. I

The operation is follows:

' Assuming the shaft A ."to=-be driven at uni'-, form speed by an electric; motor, not shown, oil will be drawn from :the main reservoir thru piped to pump'in casin I and dis charged. thru pipe H 'into tile auxiliaryreservoir T ,"fi-lling the same .up to the level atwhi'ch the open end of pipe T rests. The

pump'in section D, of greater capacity, will draw oil as fast as it reaches this level and discharge it back into the main reservoir. The pump in section F, will draw oil from chambers N, N and P-thru the shaft bearings, and discharge thru pipe Hi to the auxiliary reservoir, the suction being such as to prevent any oil from flowing along the shaft thru the end-plate Q, to the outer side of the casing. It is understood that the capacity of the pump in sectionl is greater than the burners will use, and therefore the oil le'vel may be maintained in the auxiliary reservoir.

It will be observed that there are no valves e same. V, indicates the outlet to or parts to get out of order, the only moving parts being the shafts and gears of the pump, and since they are perfectly lubricated at all times, together with the bearings,

the system is safe to operate and may be relied upon for continuous operation over lon periods of time. It will also be observe that the pump serves as a valve andno oil can be drawn from the main reservoir when it is stopped. The main reservoir can be located underground, and the auxiliary reservoir located at a height suflicient to give proper pressure at the burners 'by gravity.

Having thus described my invention I claim as new:

1. In combination, a main reservoir, an auxiliary reservoir,'two pumps driven.in unison, one of which draws oil from the main reservoir and delivers to the auxiliary reservoir and the other of which draws oil from the auxiliary reservoir and delivers to the main reservoir, the inlet to said last named pump being located at the height in said auxiliary reservoir at which the oil level is to be maintained.

' 2. In combination, a main reservoir, an auxiliary reservoir, two-pumps driven in unison,'oneof which draws oil from the main reservoir and delivers to the auxiliary reservoir and the other of which draws oil from the auxiliary reservoir and delivers to the main reservoir, the inlet to said last named pump being located at the hei ht in said auxiliary reservoir at whicht e oil level is to be maintained and having a greater pumping capacity *than said first 3;

- from the auxiliary reservoir and delivers to the main reservoir, the inlet to said last named pump being located at the height in said auxiliary reservoir at which the oil level is to be maintained said auxiliary reservoir having an outlet leading to an oil burner.

4. in combination, a main reservoir and an auxiliary reservoir, three, pumps mounted in a casing on a common shaft and driven in unison, one o'fwhich draws oil from the main reservoir and delivers to the auxiliary reservoir, one of which draws oil from'the auxiliary reservoir and delivers to the main reservoir, the inlet to said last named pump being located at the height in said auxiliary reservoir at which the oillevel is to be maintained, and the third pump drawing oil from said first and second pump and delivering to said auxiliary reservoir, and serving to lubricate said shaft and prevent flow of oil to the exterior of the caslng.

In testimony whereof I have aflixed my signature.

ALBERT E. GRANT. 

